Lock and latch mechanism.



PATENTED NOV. 20

H-. G. VOIGHT. LOOK AND LATCHMEGHANISM.

APPLIOATIO'N FILED MAR. 17. 1906.

2 SHEETS-SHEET 1.

wi/maopao UNITED STATES PATENT OFFICE.

HENRY G. VOIGHT, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO RUSSELL &ERWIN MANUFACTURING COMPANY, OF NEW BRIT- AIN, CONNECTICUT, ACORPORATION OF CONNECTICUT.

LOCK AND LATCH MECHANISM.

Specification of Letters Patent.

Patented Nov. 20, 1906.

Application filed March 17,1906- Serial No. 306,542-

To all wltom it may concern;

Be it known that I, HENRY G. VOIGHT, a citizen of the United States,residing at New Britain, county of Hartford, Connecticut, have inventedcertain new and useful Improvements in Look and Latch Mechanism, ofwhich the following is a full, clear, and exact description.

My invention relates to improvements in look and latch mechanism, andparticularly to the type set forth in application Serial No. 279,397,filed September 21, 1905, by C. J. Caley and myself.

This mechanism is designed for use on the doors of cells or rooms inasylums. The door is normally locked and no means provided for openingit from the interior. The attendant desiring to enter the room retractsthe spring-pressed latch-bolt by means of a key and opens the door. Theact of retraction of the bolt also retracts a guard or shutter on theinner side of the lock, which uncovers means operable from the innerside for retracting the latch-bolt. When the door is closed, thelatch-bolt springs out into the recess into the striker-plate and theinner operating mechanism is left exposed, so that the attendant mayinsert the key for the purpose of retracting the latch-bolt when it isdesired to leave the room. In the mechanism of. the application abovereferred to it is possible to reset the guard while the door is closedand shut off access to the operating mechanism. This would prevent theattendant from leaving the room.- To avoid this difliculty and preventtampering with the guard by the occupant of the room when the guardexposes the operating means, I have provided a stop or dogging devicewhich operates to hold the guard stationary when the door has beenclosed by the attendant passing within.

The two accompanying sheets of drawings illustrate mechanism embodyingthe principles of my invention.

Figure 1 is a horizontal section and plan view of the mechanisminvolving my inven tion. Fig. 2 is an end elevation of the mechanism.Fig. 3 shows the latch-bolt and retracting mechanism attached to theinterior of the outer side plate. Fig. 4 shows the interior of the innerside plate with the guard operating and dogging mechanism. Fig. 5

is a view of the inner side plate and attached mechanism. Fig. 6 is anexterior view of the inner side plate.

The parts are shown in the drawings in the position which they wouldoccupy if the mechanism were attached to a door, the bolt retracted, andthe door left standing open. The inner operating member for thelatchretracting mechanism is thus exposed and the guard device left inits released position.

The type of mechanism to which the invention is particularly adapted isconstructed with a view. to attachment to a door having a notch cut forthe reception of parts or the mechanism.

The plates 1 and 2 are adapted to the opposite sides of the door and areproperly alined by means of the pins 3 and 4. Suitable screws may beprovided for clamping the plates to the dooras, for instance, the screw5. One of the plates, preferably the outer plate 1, has an extension 6,forming an end plate adapted to extend across the edge of the door. Thelatch-bolt 7 is pivotally carried by this end portion and extendsthrough an opening therein in the customary manner.

8 is the knob carried by the outer plate, and 9 is a grip-like handleprovided on the lower edge of the inner plate 2. The outer knob ispreferably fixed or non-rotatable.

10 is the latch-slide carried by the outer plate, which is connected bylink 11 to the rear of the bolt 7.

12 is a spring normally holding the bolt in its extended position.

13 indicates a cylinder-lock mechanism l0- cated in the outer knob.

14 is a spindle which has a limited rotative movement relative to theplug of the cylinder-lock, so that the spindle may be partially rotatedby operation from the inner side of the look when the cylinderlug isstationary.

15 is a roll-back carried y the spindle 14 and adapted to coact with thelatch-slide 10 for retracting the latch-bolt when the spindle 14 isrotated.

16 is a hub carried by the inner side plate 2 and corresponding to theusual plug of the cylinder-lock. The spindle 14 fits in the outer end ofthis hub and may be rotated thereby upon the insertion of a key or otherinstrument from thev interior of the room when the parts are in theposition shown in the drawings.

17 is a guard plate or shutter rotatably carried by the inner side plateand provided with an opening for access to the hub 16.

18 is a sprin tending to rotate the shutter and hold it wit the stop-pin19 at the end of the curved slot in the back of the inner side plate, asshown in Fig. 4. i

20 is an arm carried by the shaft of the guard 17 and rotatabletherewith.

21 is a pivoted latch which rests against the face of the arm 20 in theposition shown in the drawings. This latch has a shoulder 22 adapted tocoact with the shoulder 23 of the arm 20 and hold the arm and guard inthe closed position. (Shown dotted in Fig. 4.) Itis to prevent thisclosing of the shutter when the door is in the closed position that Ihave provided the improvements of this application.

24 is a dog adapted to be introduced beneath the shoulder 25 ofthe arm20.

26 is a lever pivoted at 27 and pressed outward by the spring 28 intotheposition shown in Fig. 1 when the door is open. The dog 24 is pivotedto the lever 26 and pressed by the spring 29 against the stop 30 on thelever. When the door to which the mechanism is attached is closed, theoperating-lever 26 strikes against the door frame or casing and istilted into the position shown in dotted lines in Fig. 5. In thisposition the dog 24 engages the shoulder 25 of the arm 20 and preventsthe closing of the guard so long as the door remains closed. When thedoor is opened, the operator 26 is moved to the position shown in fulllines, and the dog 24 is thrown out of engagement with the guardarm bythe action of the spring 28.

The rotation of the hub 16 for the purpose of retracting the latch-boltis opposed by the spring 31, so that when the latch-bolt has beenretracted, the door opened, and the key removed the spring rotates thehub auto matically to its proper position.

32 is an arm or roll-back carried by the hub 16 and having a limitedrotative movement relative thereto, asshown in the former application.One end of the spring 31 engages this roll-back 32 and tends to rotateit and move it toward engagementwith the shoulder 33 on the latch21.When the attendant wishes to pass out, he manually rotates the guard17'toward its closed position, and the pressure of the roll-back 32against the incline of the latch 21 moves the latch so that the shoulder22 is interposed beneath the shoulder 23 of the guard-arm 20, thuslocking the guard in its closed position. When the door is again closedas the attendant passes out, the striking of the operator 26 against thedoor-casing brings the dog down and on top of the guard-arm 2O but sincethe dog is pivoted to the operating-lever this action is permitted.

When the door has been closed from the exterior, the latch-bolt may beretracted by the operation of a key in the cylinder-lock 13. Rotation ofthe spindle 14 by this means rotates the hub 16 and roll-back 32. Therollback then enga es the tail 34 of the latch 21 and swings the atchout of engagement with the guard-arm 20. The guard-spring 18 then throwsthe guard into the open position, as shown in the drawings.

What I claim is 1. In a latch mechanism, a bolt, means for retractingthe bolt including an actuating member accessible from one side of themechanism, a guard independent of the bolt nor mally preventing access,means for opening the guard, and means for preventing the guard frombeing closed when thedoor to which the mechanism is attached is closed.

2. In a lock and latch mechanism, a latchbolt, means at one side of themechanism for retracting said bolt, arotatable hub accessible from theopposite side of the mechanism and connected to the latch-retractingmeans, a roll-back rotatable by said hub, a guard for preventing accessto said hub, an arm movable with said guard, and a latch member operableby said roll-back for engaging said arm and holding said guard in itsclosed position.

3. In a latch mechanism, a'latch-bolt, an actuating member accessiblefrom one side of the mechanism, operable means of connection betweensaid actuating member and said latch-bolt, a guard normally preventingaccess to said actuating member, means for opening said guard, andautomatically-operable means for preventing the closing of said guard.

4. In a latch mechanism, a latch-bolt, an actuating member accessiblefrom one side of the mechanism, operable means of connection betweensaid actuating member and said latchbolt, a guard independent of thebolt normally preventing access to said actuating member, means foropening said guard, and

means for preventing the closing of said guard.

5. In a latch mechanism, a latch-bolt, an actuating member accessiblefrom one side of the mechanism, operable means of connection betweensaid actuating member and said latch-bolt, a guard normally preventingaccess to said actuating member, means for opening said guard, andpivoted means for preventing the closing of said guard.

6. In a latch mechanism, a latch-bolt, an actuating member accessiblefrom one side of the mechanism, operable means of connecti on betweensaid actuatin member and said latch-bolt, a guard norma lly preventingaccess to said actuating member, means for opening said guard, andpivoted spring- ITS pressed means for preventing the closing of saidguard.

7. In a latch mechanism, a latch-bolt, an actuating member accessiblefrom one side of the mechanism, operable means of connec tion betweensaid actuating member and said latch-bolt, a guard normally preventingac-' its closed position, and a dogging device for holding the guard inits open position.

9. In a latch mechanism, a bolt, an actuating member, means ofconnection between said actuating member and said bolt, a guard forpreventing access to said actuating mem ber, an arm rotatable with saidguard, a latch for said arm, a roll-back carried by said'actuatingmember, and a spring holding said rollback in yielding engagement withsaid latch.

10. In a latch mechanism, a bolt, an actuating member, means ofconnection between said actuating member and said bolt, a

spring-pressed guard, an arm rotatable therewith, a roll-back operableby said actuating member, a pivoted latch member having a portionadapted to engage said arm and an other portion adapted to be-engagedbysaid roll-back for releasing said latch from said arm.

11. In a latch mechanism, plates adapted to the opposite sides of adoor, a latch-bolt carried by an extension from the outer plate, alatch-slide carried by said outer plate, means accessible from the outerside of the lock for retracting said slide, an actuating memberaccessible from the inner side of the lock for retracting said slide, aguard for preventing access to said actuating member, means for openingsaid guard, and means for locking said guard in its open position whenthe door to which the mechanism is attached is closed.

12. In a door-lock, bolt-actuating mechanism, a guard therefor, meansfor opening the guard, means for holding the guard open While the dooris closed said means permitting the guard to be released when the dooris open and means for holding the guard closed.

HENRY G. VOIGHT. Witnesses:

M. S. WIARD, CHAS. E. RUssELL.

